Jonathan Jones: Diabolically grotesque art – from Jonathan Payne’s sprouting finger sculptures right back to Hieronymus Bosch – has staying power. As long as we have bodies, we will experience body horror

His films captured John Lennon in bed, the Velvet Underground deafening a roomful of psychiatrists, and New York during the high point of the last real avant garde. Adrian Searle tunes into a remarkable retrospective

Jonathan Jones: As we count down to London 2012, now's the time to look at how clocks – from Dalí's melting watches to Sarah Morris's Big Ben artwork – have long inspired art or are works of art in themselves